Automatic lock for hoisting mechanism.



No. 649,137. .Patented May 8, 1900.

' M. MOUNT.

UTMATIG LOCK FDR HOISTING MECHANISM.

(Application led Jan. 21, 1899.)

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m: nunms PErERS co.. PHaro-Llmo.. WASHINGTON. D. c,

PATENT MARK MOUNT, OF NEW YORK, N. Y.

AUTOMATIC LOCK FOR HOISTING MECHANISIVI.

SPECIFICATION forming part of Letters Patent No. 649,137, dated May 8,1900.

' Applicationiiled January 21,1899. Serial No. 702,976. (No model.)

To all whom t may con/cern..

Be it known that I, MARK MOUNT, a citizen of the United States, and aresident of New York, (Brooklym) in the county of Kings and State of NewYork, have invented certain new and useful Improvements in AutomaticLocks for Hoisting Mechanism, of which the following is a specification.

The general principle of my invention is that of using the force of theweight being lifted to hold such weightv at all times under control. Tothis end the load is suspended on a sleeve that is loose on the mainshaft, which sleeve is combined with a friction device or clutch and alever connection between such sleeve and clutch, the combination beingsuch that the load being raised is made to operate the friction-clutchthrough the agency of the lever and the loose sleeve.

The invention is applicable to hoisting mechanism in general, andparticularly to apparatus known as dumb-waiters.

In the annexed drawings I have shown a contrivance which illustrates myinvention, whereinl Figure I is a side elevation of the apparatus. Fig.II represents a partial top view and horizontal section. Fig. IIIrepresents a crosssection on the line :c 0c, looking in the direc-1 tionof the arrow marked 3 3 Fig. IV, a like section on same line, looking inthe direction of arrow marked 4.. Fig. V represents a side view of ahead on the sleeve. Fig. VI represents a cross-section of Fig. V. Fig.VII shows'a side view of the lever used to connect the sleeve andfriction-clutch.

Aindicates the main shaft, journaled in suitable bearings I., andcarries a sleeve B, which is loose on the main shaft.

C is the operative wheel, made fast on shaft A.

D indicates the hoist-wheel, made fast to the sleeve B, on which wheelthe weight to be raised is suspended in the usual way.

E F are a lock-case and disk, jointly form# ing a receptacle in whichare contained the clutch-fixtures for locking the hoist-wheel againstthe pull of the weight or load. The

lock-case E encircles the sleeve B, the latter being free to turntherein. The disk F is secured to the main shaft and rotates with it,while F. is held stationary by means of a loop J, which is engaged byafixed bracket I, being secured against casual displacement later ally bya pin K, the parts E and F constituting a cover and box in which allclutch mech-` anism, including the lever, in inclosed and protected.Theinner face of disk F, Fig. IV, has two cavities N, arrangeddiametrically opposite, and when the shaft A is turned they engage withlugs O O on the face of a head P, formed with or cast on the end ofsleeve B, and thus the sleeve and hoist-wheel are revolved by and withthe shaft. The disk F has projectionsUV, termed tappets,7 whose purposeis to rotate the clutch-fixtures, as will appear.

Within the lock-case E is a friction device, whose function, inconnection with the lockcase and a lever, also Within the lock-case, isto constitute a friction-clutch for automatically holding in check thebackward motion of the hoist-wheel to prevent the descent of the weighthoisted, as hereinafter described. The friction device I prefer to useconsists of a ring G, normally running freely in the locklock-case, thering is cut open, so as to be capable of expansion, and receives in thecleft the fulcrum end S of a lever H, which by a slight side strainexpands the ring G.

case E. To adapt it to hold and letgo of the When thus expanded,friction is produced n against the inner periphery of lock-case E, andsuch friction is automatically applied by the load itself, as suspendedon the loose sleeve, the latter operating the lever. For this purposethe lever II has a notch y near its fulcrum, which is engaged by an earQ on the sleeve, located just behind the lug O thereof. 1 1

When the fulcrum S of the lever is in alinement with the cleft in thering G, the ring is free. With the load suspended on the left-hand side,looking at Fig. III, its constant tendency is to cause the sleeve-headto force the lever by a scarcely-perceptible movement ont of itsalinement in the direction indicated by the arrow 6 and so to pry openand expand the ring, a small push-spring t between the lever and thesleeve acting as auxiliary, and an opposite movement brings the leverinto alinement again. To prevent the lever in such opposite movementfrom going beyond such alinement and there binding the ring fast, I

IOD

employ a limiting-stop, for which, to avoid extra parts, I form aprotuberance lr on the lever, adapted to abut against the side of headP, and which is also a means of ad- 'ustinf1r the levers motion, beingfiled awa J e y when assembling the parts until the proper amount ofplay is obtained. 'When the parts are in position, as indicated in Fig.III, the tendency of the spring t is to cause the lever H to maintainthe ring G expanded enough to createa slight frictional resistanceagainst the lock-case E.

To raise the load, the wheel C is operated to turn the shaft A and diskF in the hoisting direction `indicated by the arrow 5. The ends of thecavities N N contact with the lugs O O of the sleeve-head, and the ringG being momentarily held stationary by the .frictional resistanceofspring t, as aforesaid,

the ear Q of lug O brings the lever close against the sleeve-head P andinto alinement, as indicated in Fig. III, allowing the ring to contractand free itself from the lock-case. At the same time the tappets U Vcontact with projections W m of ring G, and it and the lever H all goaround together, while the load is raised through operation of the diskF acting on head P of sleeve B, carrying the hoist-wheelD. Whenever thehoisting stress on Wheel C is relaxed, leaving the load to be supportedagainst falling, the first action is of the springt, which forces thelever H away from the sleeve-head, so that the fulcrum end will bebrought into an inclined position with relation to the ends m m of thering G, so as to expand it. At the same time the load will, throughwheel D and sleeve B, tend to turn the head P in the opposite directionto that indicated by the arrow 5, causing the ear Q of the sleeve-headto force the lever in the expanding direction, compelling the ring G tohold fast to the case E and prevent the load from falling by action ofits own weight, such hold of the ring increasing with the weight of theload.

To lower the load, the parts being in the position just described, thewheel C is operated to turn the shaft A and disk F in the directionopposite to that indicated by the arrow 5, when the disk F and shaftwill iirst have a short lost motion within lthe sleeve B, since therecesses N N are longer than the lugs O O' are wide. In this lost motionthe projection U on the disk F, Fig. III, will contact with the outerend S' of lever H, forcing it close against the sleeve-head, being theposition of alinement and that in which the strain is taken off thelever,and the ring G allowed to contract and become released. The loadwould then drop were it not for the constant operation of thesleeve-head at the Tulcrum end of the lever, thereby to throw on thefriction of the ring G as a brake, which, however, is again immediatelyreleased by continued turning of wheel C and the action of tappet U ofthe disk F on the outer end of the lever H, asbefore explained.

It is desirable to provide for suspending the load from the right orleft hand side of the hoist-wheel, according to choice and ascircumstances require. To this end the lever H is made capable ofremoval and inversion, being adapted,with.itsassociated parts, to beremoved and reinserted in a reversed position, the spring t being thenplaced on the opposite side of head P, the same being furnished with asmall piu R on either side to hold the spring. (See Fig. VI.) By thismeans the machine may be changed from right to left or left to rightwithout any change in the construction of the parts.

The'object of having duplicate tappets and V' on the disk F andprojections W and m on ring G is to provide parts adapted to both theright and left hand positions of the lever H.

The above-described invention is valuable for hand-Worked elevators andother purposes and is not confined to specific forms or details.

I claim as my invention;-

1. The combination of the main shaft, the sleeve, and sleeve-head, thehoist-wheel fixed on the sleeve, the stationary lock-case, the splitfriction-ring therein, and the lever fulcrulned between the ends ofthe'ring, and engaged by the sleeve, whereby the weight of the loadoperates to expand the ring against the lock-case and holds the loadfrom falling.

2. The combination of the main shaft, the loose sleeve carrying thehoist-wheel and having a head P, a rotary disk F made fast to the shaftand engaging the sleeve-head, the stationary lock-case, friction-ring Gtherein and the lever H engaging said ring, said head being providedwith ears Q engaging the lever and operating to release the ring fromthe lock-case when theshaft is revolved in one direction, the disk Fbeing provided with means for actuating said lever to release Said ringwhen the shaft is rotated in the opposite direction.

Signed at New York city, in the county of New York and State of NewYork, this 20th day of January, A..D. 1899.

` MARK MOUNT.

lVitnesses':

CHAS. WAIILERS, H. J. I-IANsoN.

IOC

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